Earlier quoted context omitted.
I'm not sure that's the case, since I'm not sure if government-funded research was more of an effect or a cause of the decline of privately-funded research.
Really, though, it's hard to find credible reasons why companies would fund fundamental (say) physics research, isn't it? The benefits of such research are often felt decades down the line.
However, I think there might be a naming problem, here. If it seems likely to have practical applications at some point, it's not "fundamental" or "pure" research anymore. Companies doing research into quantum computers or molecular assembly are certainly doing so because they expect to make a profit on it eventually, but the very fact that they have this expectation means that it's disqualified from fundamental research. I still think that there are examples of companies funding general research on the assumption that something will come of it, but it's hard to disentangle the effects of government. The most prominent example, Bell Labs, was run by a government-supported monopoly, for example.